fn=2n+1

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Solution for fn=2n+1 equation: 


Simplifying
fn = 2n + 1

Reorder the terms:
fn = 1 + 2n

Solving
fn = 1 + 2n

Solving for variable 'f'.

Move all terms containing f to the left, all other terms to the right.

Divide each side by 'n'.
f = n-1 + 2

Simplifying
f = n-1 + 2

Reorder the terms:
f = 2 + n-1

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